Yes supposedly from what I heard one person many years back claimed like Tim Atwood who found all those sealed stadium events that he found a box full of CIB Air Raid (17 of them). Although no confirmation or evidence was provided suddenly the same year 4-5 copies of the game sold online and in private auctions. The price of the game became very debatable and dropped dramatically because of this
I have only seen a couple cib air raids sell on ebay in the past 10 years so if new in box were found one would have surfaced by now.
I'm sure a sealed box or two of stadium events have been found its not that rare but sells for 20 to 40k range because the hoard of Nintendo collectors, they need a holy grail too even though there's probably a couple hundred copies.